Basler Electric DGC-2020 - Manual (Page 174)

Per Unit
Settings which are related to machine ratings can be set in either actual units of hertz or in per unit
values. Per unit settings are available for Pickup
K (81O/81U) and Inhibit Volts L (81U). When a native unit
is edited, BESTCOMSPlus automatically recalculates the per unit value based on the native unit setting
and the rated data parameter (on the System Parameters, Rated Data screen) associated with it. When a
per unit value is edited, BESTCOMSPlus automatically recalculates the native value based on the per unit
setting and the rated data parameter associated with it.
Once all per unit values are assigned, if the rated data parameters are changed, BESTCOMSPlus
automatically recalculates all native unit settings based on the modified rated data parameters.
The following settings have native units of Frequency in Hz, and the rated data associated with them is
Rated Frequency (on the System Parameters, Rated Data screen).
•
81 U Pickup
•
81 O Pickup
The following setting has native units of Secondary Volts, and the rated data associated with it is Rated
Secondary Volts (on the System Parameters, Rated Data screen).
•
81 U Inhibit Voltage
The BESTCOMSPlus Frequency screen is illustrated in Figure 4-54.
Figure 4-54. Frequency
A Underfrequency Pickup: Adjustable from 45 to 66 Hz in 0.1 Hz increments for 50/60 Hz controllers
(style number x1xxxxxxx). Adjustable from 360 to 440 Hz in 0.1 Hz increments for 400 Hz controllers
(style number x2xxxxxxx).
B Underfrequency Activation Delay: Adjustable from 0 to 30 s in 0.1 s increments.
C Underfrequency Alarm Configuration: None, Alarm, Pre-Alarm, or Status Only.
D Underfrequency Inhibit Volts: Adjustable from 70 to 576 Vac in 1 Vac increments.
E Hysteresis: Adjustable from 0.1 to 40 Hz in 0.1 Hz increments.
F Overfrequency Pickup: Adjustable from 45 to 66 Hz in 0.1 Hz increments for 50/60 Hz controllers (style
number x1xxxxxxx). Adjustable from 360 to 440 Hz in 0.1 Hz increments for 400 Hz controllers (style
number x2xxxxxxx).
G Overfrequency Activation Delay: Adjustable from 0 to 30 s in 0.1 s increments.
H Overfrequency Alarm Configuration: None, Alarm, Pre-Alarm, or Status Only.
I Hysteresis: Adjustable from 0.1 to 40 Hz in 0.1 Hz increments.
J Alternate Frequency Scale Factor: 0.001 to 100 in increments of 0.001.
K Pickup (Per Unit): Range varies based on the values of the native unit setting and the associated rated
data parameter.
L Inhibit Volts (Per Unit): Range varies based on the values of the native unit setting and the associated
rated data parameter.
Reverse Power Protection (32R)
Two sets of reverse power settings are provided: one for three-phase generator connections and one for
single-phase generator connections. The pickup setting entered is based on the percentage of the
4-64 DGC-2020 BESTCOMSPlus
® Software
9400200990 Rev X